A bus starting from rest moves with a uniform acceleration of 0.1ms –2 for 2 minutes. Find
(a) the speed acquired,
(b) the distance travelled.
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A bus starting from rest moves with a uniform acceleration of 0.1ms –2 for 2 minutes. Find (a) the speed acquired,
Acceleration (a)=0.1ms-2 Time (t)=120seconds W k t, a) distance S = ut+1/2 a t2 = 0+1/2 x 0.1 x 14400 = 720 m b) speed = distance/ time = 720 / 120 = 6 ms-1 In this solved problem...
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When will you say a body is in (i) uniform acceleration? (ii) non-uniform acceleration?
(i) A body is said in uniform acceleration when its motion is along a straight line and its velocity changes by equal magnitude in equal interval of time. (ii) A body...
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A car moves with a speed of 40 km/h for 15 minutes and then with a speed of 60 km/h for the next 15 minutes. The total distance covered by the car is:
(ii) 25 km------------------- Solution: Case I: Speed = 40 km/h Time = 15 min = 15/60 hour Distance = Speed × Time = 40×15/60=10 km Case II: Speed = 60 km/h Time = 15 min = 15/60 hour Distance...
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A bus travels 54 km in 90 minutes. The speed of the bus is
Answer is (b) 10 m/s
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A scooter starting from rest moves with a constant acceleration for a time ∆t1, then with a constant velocity
(d) > 500N for time Δt1 and Δt3 and 500N for Δt2. Explanation: During the constant velocity for time Δt2 there is no relative movement between the man and the seat and only force applied by the seat on...
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A wheel is making revolutions about its axis with uniform angular acceleration. Starting from rest, it reaches 100 rev/sec in 4 seconds.
ω0 = 0 ; ρ = 100 rev/s ; ω = 2 ; ρ = 200 π rad/s ω = ω0 = αt ω = αt α= (200 π)/4 = 50 π rad /s2 or 25 rev/s2 θ = ω0t + 1/2...
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A scooter starting from rest moves with a constant acceleration for a time Δt1.
(d) > 500N for time Δt1 and Δt3 and 500N for Δt2. Explanation: During the constant velocity for time Δt2 there is no relative movement between the man and the seat and only force applied by the...
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When a particle moves in a circle with a uniform speed (a) its velocity and acceleration are both constant
(d) its velocity and acceleration both change. Explanation: Velocity and acceleration are both vectors and a vectors is fully defined with its magnitude and direction. Even when one entity changes, the vector...
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A bus covers a distance of 2,924 kms in 43 hours. What is the speed of the bus?
(c) Speed of bus = Distance covered / Time taken =2924/43= 68 kmph.
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A bus travels at the speed of 49 kmph and reaches its destination in 7 hours. What is the distance covered by the bus?
(a) Distance covered = Speed × Time = 49 × 7 = 343km
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